package demo9;

/**
 * @author Huangjin
 * @version 1.0
 * describe:
 * @date 2023/3/1 17:51
 */
public class IntegerDemo {
    public static void main(String[] args) {
        int max = Integer.MAX_VALUE;
        int min = Integer.MIN_VALUE;
        System.out.println("int的最大值为:"+max+"，最小值为:"+min);

        long max1 = Long.MAX_VALUE;
        long min1 = Long.MIN_VALUE;
        System.out.println("long的最大值为:"+max1+"，最小值为:"+min1);

        String s1 = "39";
        int age = Integer.parseInt(s1);
        System.out.println(age);

        String s2 = "123.456";
        double price = Double.parseDouble(s2);
        System.out.println(price);

        //Integer i = 5;
        //int j = i;

        Integer i1 = new Integer(5);
        Integer i2 = new Integer(5);
        System.out.println(i1==i2);
        System.out.println(i1.equals(i2));
        Integer i3 = Integer.valueOf(5);
        Integer i4 = Integer.valueOf(5);
        System.out.println(i3==i4); //true
        System.out.println(i3.equals(i4)); //true，包装类重写equals()比较值了
        int i = i4.intValue();
        System.out.println(i);

    }
}
